SB2020042721 - Multiple vulnerabilities in QEMU

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2020-11869)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow within the implementation of ATI VGA emulation in ati_2d_blt() routine in hw/display/ati-2d.c while handling MMIO write operations through the ati_mm_write() callback.. A remote attacker on the guest operating system can abuse this flaw to crash the QEMU process, resulting in a denial of service.

2) Buffer overflow (CVE-ID: CVE-2020-11102)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary within hw/net/tulip.c in QEMU during the copying of tx/rx buffers because the frame size is not validated against the r/w data length. A remote attacker can  trigger memory corruption and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• http://www.openwall.com/lists/oss-security/2020/04/24/2
• https://git.qemu.org/?p=qemu.git;a=commit;h=ac2071c3791b67fc7af78b8ceb320c01ca1b5df7
• http://www.openwall.com/lists/oss-security/2020/04/06/1
• https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg08322.html